55520640 has 448 divisors, whose sum is σ = 240809760. Its totient is φ = 11943936.

The previous prime is 55520639. The next prime is 55520669. The reversal of 55520640 is 4602555.

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 3265912 + ... + 3265928.

Almost surely, 2^55520640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55520640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120404880).

55520640 is an abundant number, since it is smaller than the sum of its proper divisors (185289120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55520640 is an equidigital number, since it uses as much as digits as its factorization.

55520640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61 (or 34 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 55520640 is about 7451.2173502053. The cubic root of 55520640 is about 381.4914607649.

The spelling of 55520640 in words is "fifty-five million, five hundred twenty thousand, six hundred forty".